Air-regulating attachment for carburetors



April 14, 1925. 1,533,980 W. FALWELL AIR REGULATING ATTACHMENT FORCARBURETORS Filed Nov. 5 1923 Patented Apr. 14, 1925. V

UNITED STATES PATENT OFFICE.

WRAY FALWELL, OF FITCHBURG, MASSACHUSETTS, ASSIGNQR ZED EMERSON W.

BAKE-1B,, OF FITOHBUKG', MASSACHUSETTS.

AIR-BEGULA'I'ING ATTACHMENT FOR GARBURETOES.

Applicat on filed November To all 207mm it may concern:

Be it known that I, Year FALWELL, a citizen of the United States.residing at Fitchburg, in the county of .Vorcester and Commonwealth ofMassachusetts, have invented a new and useful. Improvement inregulatingattachment for carburetors, and

p is designed for use especially with those types of carburetors whichare devoid of air control devices, i. e., carburetors such as are ingeneral use on Ford cars and many other motor vehicles. 1 i

The present invention contemplates an air control device which can beoperatively associated with such a carburetor with the greatest ease andfacility, and with no necessity for the use of special fittings or anyattaching device whatsoever. The invention also contemplates a device ofthis class which, by its construction, absolutely insures against thepossibility of error in its positioning, and which, by its construction,furthermore is not subject to damage or breakage in the event ofback-firing by the engine. The above and other objects are obtained bythe novel construction hereinafter described and claimed, referencebeing had to the accompanying drawings, wherein- Fig. 1 is a sideelevation, partly in section, showing my improved device in operativeassociation with a carburetor of the type used on Ford and otherengines.

Fig. 2 is an enlarged View in side elevation of said device orattachment.

Fig. 3 is a developed view of the blank from which said device ispreferably made.

Fig. 4 is a vertical sectional view on the line 4-4 of Fig. 2.

Fig. 5 is a top plan view of mydevice or attachment. 7

Like reference characters refer to like parts in the different figures.

Referring first to Fig. 1, the carburetor 1, of ordinary and well knownconstruction, is shown in connection with the inlet manifold 2 of aninternal combustion engine, and the air supply for said carburetor isshown as being delivered thereto by means of a pipe 3, the latter havingits entrance 4 flared to extend over a portion of the exhaust manifold5, so that the air supply is suitably heated before delivery to thecarburetor.

The hot air pipe'or fitting 3 is here shown as of the type that isuniversally used with carburetors of Ford engines, there being a rightangle bend in said pipe, as indicated at 6, Fig. l, which isadvantageously utilized in my invention, as hereinafter clescribed. p r

The attachment which forms the subject matter of my inventionispreferably made from a sheet metal blank or stamping of the formindicated in Fig. 3, the same compris-' ing an annular portion 7 havingfour projecting radial wings 8, 8, with a connected tongue 9 extendingfrom each of said wings. Two of said wings 8, 8, lying oppositely toeach other, are bent or pressed upwardly,

and the other two are bent or pressed downwardly, all of said wings inthis operation being curved so as to constitute arcs of a cylinder whoseoutside diameter corresponds substantially to the inside diameter of thepipe 3. With the wings thus bent and curved, the blank of Fig. 3 assumesthe form of a skeleton cylinder, as'shown in Fig. 2, the annular portion7 constituting a transverse dividing partition in said cylinder,'and thewings 8, 8 constituting the cylinder walls proper, as will be readilyunderstood. The tongues 9, 9 of said wings are bent over toward eachother at right angles, and the apertures 10, 10 of their overlappingportions thus come into registry to provide bearings for a spindle 11,whose ends, after insertion of said spindle, are upset or enlarged toprevent endwise displacement thereof.

The spindle 11 carries a circular valve member 12 which is free to slidelongitudinally on said spindle, and which normally is maintained midwayof the skeleton cylindrical casing, in the opening 13 of trans versepartition 7, by springs 14, 14 on opposite sides thereof, encirclingsaid spindle and confined between said valve and the tongues 9, 9 ateither end. The opening 13 is of greater diameter than valve 12 andhence, even in this centered position of the valve, there is always anannular passage between it and the inner periphery of the partition; ashereinafter described, the area of this passage varies with thesuctionproduced by the engine, when the attachment is operativelyassociated with the carburetor.

Such operative association is accomplished simply by removing the usualhot air pipe or fitting 3, and by inserting the attachment into theflared entrance 4:, whence it drops to the bottom of the vertical leg ofsaid pipe, coming to rest at the right angled bend 6. Thereupon, thepipe or fitting 3, with the attachment of my invention inserted therein,is replaced on the engine, in the usual relation to the carburetor. Y Nospecial fittings or attaching devices of any kind whatsoever arerequired, since the attachment, once inserted, seeks and retains itsproper position by the action of gravity alone. Moreover, it isimpossible to get the attachment inserted in any but the correct way,since the valve mechanism is double-acting, and the springs work in thesame way from both sides thereof. With the attachment in place, theamount of heated air supplied to the car buretor is automaticallyregulated by the suction, and by the use ot'the device the motor vehiclecan be throttled down to a very slow speed on high gear and it has alsobeen found that the vehicle when using this device can be started easierin cold weather and can be more readily accelerated otherwise. Amaterialsaving of fuel is also efi'ected. As the suction increases, the valve 12is automatically shifted and, by moving away from the partition 7,increases the opening for the passage of air to the carburetor. In theevent of the engine back-firing, no damage or breakage can occur, sincethe pressure operating on the valve is cushioned by the outer spring 14.

I claim- 1. As a new article of manufacture, an air regulatingattachment for a carburetor, comprising a double-acting yielding checkmember offering the same resistance to air in either directioninsertible either end foremost in a vertical leg of the hot-air supplytube leading to said carburetor.

2. As a new article of manufacture, an air regulating attachment for acarburetor, comprising a casing of skeleton cylindrical formproviding acentral partition and made from a single stamping, the latter havingoppositely bent wings, with inturned tongues on'said wings toprovidebearings at each end of said casing for a spindle runninlongitudinally of said casing, and sai spindle having thereon, in thevicinity of said partition, a slidable valve member subject to springpressure on both sides.

WRAY EALWELL-

